My first thought is power. It could either be your power supply crapping out (or being overly strained), or it could just be that you dont get good clean power, meaning you should invest in a line conditioner.
It could also be some other kind of hardware going bad. I had similar problems for a long time that turned out to be a faulty motherboard. Unfortunately, it could be any number of different things. It really helps to have friends with spare parts so that you can swap things out and eliminate possible problems one at a time--I know I never would have fixed half of my problems had I not.
Here is another tip--dont cheap out on components. It took me three months to get my last computer running stably because I went the cheap route and got a cheap mobo, PSU, etc. Dont do it, it isnt worth the headache.
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"Good people do not need laws to tell them to act responsibly, while bad people will find a way around the laws."
--Plato
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